Here is the full list of all 33 RUINER achievements.
Hack 50 enemies
Finish Arena:Colosseum
Score more than 50000 points in Arena:Colosseum
Beat the game on Normal Difficulty
Beat the game on Hard Difficulty
Finish NewGame+
Use dash 9001 times
Destroy all dead Hosts' piles
Do 1003 pushups
Kill all Angels
Burn 420 enemies with flamethrower
Hit 50 mines with your melee weapon
Acquire all basic abilities
Destroy Angel core in the air
Achieve 15 kills combo
Kill 75 enemies with a shield ram
Finish Epilogue
Beat the game on Easy Difficulty
Defeat Sisters
Collect all bounties
Unlock all iChing fortunes
Complete CATS quest
Defeat TrafficKing
Destroy 3 Angel cores in one go
Kill 3 enemies with a one explosion
Perform 50 Ruiner kills
Defeat Nerve
Reflect 100 bullets with your shield
Finish Prologue
Beat the game without dying
Die 666 times
Finish Speedrun
Acquire all outfits